How to use the content attribute in css-CSS Tutorial-php.cn

How to use the content attribute in css

王林

Release： 2020-04-14 09:34:59

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How to use the content attribute in css

The content attribute is generally used in ::before and ::after pseudo-elements to present the content of the pseudo-element. Usually, the content attribute value that we use most often is a pure character. In fact, it has many values to choose from.

1. Insert pure characters

<style>
    *{margin: 0;padding: 0;box-sizing: border-box;}
    li{list-style: none;}
    .content{
        position: relative;padding: 10px;
        border: 1px solid #666;margin: 10px;
    }
    .content.only-text::before{
        content: &#39;插入纯字符&#39;;
    }
</style>

<body>
    <h1>1、插入纯字符</h1>
    <div class="content only-text"></div>
</body>

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(Recommended tutorial: CSS Getting Started Tutorial)

2. Insert pictures

<style>
    *{margin: 0;padding: 0;box-sizing: border-box;}
    li{list-style: none;}
    .content{
        position: relative;padding: 10px;
        border: 1px solid #666;margin: 10px;
    }
    .content.fill-image::before{
        content: url(&#39;https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo_top_86d58ae1.png&#39;);
    }
</style>

<body>
    <h1>2、插入图片</h1>
    <div class="content fill-image"></div>
</body>

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3 , Insert element attributes

<style>
    *{margin: 0;padding: 0;box-sizing: border-box;}
    li{list-style: none;}
    .content{
        position: relative;padding: 10px;
        border: 1px solid #666;margin: 10px;
    }
    .content.fill-dom-attr::before{
        content: attr(data-title);
    }
</style>

<body>
    <h1>3、插入元素属性</h1>
    <div class="content fill-dom-attr" data-title="我是.fill-dom-attr元素的 data-title 属性值"></div>
</body>

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4. Insert the current element number (i.e., the current element index)

This feature can be used to introduce the rules of the active page.

<style>
    *{margin: 0;padding: 0;box-sizing: border-box;}
    li{list-style: none;}
    .content{
        position: relative;padding: 10px;
        border: 1px solid #666;margin: 10px;
    }
    .fill-dom-index li{
        position: relative;
        /* 给计数器加器起个名字，它只会累加 li 标签的索引，li元素中间的div并不会理会 */
        counter-increment: my;
    }
    .fill-dom-index li div::before{
        /* 使用指定名字的计算器 */
        content: counter(my)&#39;- &#39;;
        color: #f00;
        font-weight: 600;
    }
</style>

<body>
    <h1>4、插入当前元素编号(即当前元素索引)</h1>
    <div class="content fill-dom-index">
        <ul>
            <li><div>我是第1个li标签</div></li>
            <div>我是li标签中的第1个div标签</div>
            <li><div>我是第2个li标签</div></li>
            <li><div>我是第3个li标签</div></li>
            <div>我是li标签中的第2个div标签</div>
            <li><div>我是第4个li标签</div></li>
            <li><div>我是第5个li标签</div></li>
        </ul>
    </div>
</body>

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5. Insert the current element number (specified type)

<style>
    *{margin: 0;padding: 0;box-sizing: border-box;}
    li{list-style: none;}
    .content{
        position: relative;padding: 10px;
        border: 1px solid #666;margin: 10px;
    }
    .fill-dom-index2 li{
        position: relative;
        counter-increment: my2;
    }
    .fill-dom-index2 li div::before{
        /* 第二个参数为list-style-type，可用值见： http://www.w3school.com.cn/cssref/pr_list-style-type.asp*/
        content: counter(my2,lower-latin)&#39;- &#39;;
        color: #f00;
        font-weight: 600;
    }
</style>

<body>
    <h1>5、插入当前元素编号(指定种类)</h1>
    <div class="content fill-dom-index2">
        <ul>
            <li><div>我是第1个li标签</div></li>
            <div>我是li标签中的第1个div标签</div>
            <li><div>我是第2个li标签</div></li>
            <li><div>我是第3个li标签</div></li>
            <div>我是li标签中的第2个div标签</div>
            <li><div>我是第4个li标签</div></li>
            <li><div>我是第5个li标签</div></li>
        </ul>
    </div>
</body>

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Recommended related video tutorials: css video tutorial

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